Coating compositions and process therefor

Claim 2

PROCESS FOR PRODUCING THERMOSETTING COATING COMPOSITIONS FROM SATURATED POLYESTERS CONTAINING HYDROXY GROUPS AND AMINOPLAST RESINS, CHARACTERIZED IN THAT A) N MOLS OF ONE OR MORE COMPOUNDS HAING TWO FREE OR LATENT HYDROXY GROUPS ARE REACTED WITH B N + 1 MOLS OF A DICARBOXYLIC ACID WHICH WILL NOT FORM AN ANHYDRIDE, TO FORM A LINEAR POLYESTER AB CARRYING TERMINAL CARBOXY GROUPS, C. THEREAFTER POLYESTER AB IS REACTED AT AN ELEVATED TEMPERATURE, WITH ELIMINATION OF REACTION WATER UNTIL A LOW ACID VALUE IS OBTAINED WITH AN AMINE ALCOHOL OF THE GENERAL FORMULA

Claim 3

Process according to claim 1 characterized in that the average molecular weight of the linear polyester AB ranges between 500 and 10,000.

Claim 4

Process according to claim 2 characterized in that the average molecular weight of the polyester AB ranges between 1,000 and 3,000.

Claim 5

Process according to claim 1 characterized in that in the general formula for the amine alcohol C, n is 2 and X is a hydroxymethyl radical.

Claim 6

Process according to claim 1 characterized in that the reaction with the amine alcohol is carried out at 150* - 200*C.

Claim 7

Process according to claim 1 characterized in that the acid value of the reaction product of ABC is below 1 mg.KOH/g.

Claim 8

Process according to claim 1 characteRized in that the combination of the reaction product of ABC with the aminoplast resin is carried out in the presence of solvents at reflux temperature.

Claim 9

Process according to claim 1 characterized in that the combination of the reaction product of ABC with the aminoplast resin is carried out in the presence of an acid catalyst.

Claim 10

Process according to claim 8 characterized in that the acid catalyst is p-toluol sulfonic acid.

Claim 11

Process according to claim 1 characterized in that the products are rendered water soluble through reaction with inorganic or organic acids, in the presence of water tolerant solvents.

Claim 12

Process according to claim 1 characterized in that 1 mol of the linear polyester AB is reacted with 2 mols of 2-amino-2-ethylpropanedio-1,3 the two hydroxy groups of the oxazoline ring re-etherified with each one methylol group of aminoplast resin D; additional reaction product of C with linear or optionally pre-condensed polyester AB is added thereto and the product rendered water soluble with inorganic or organic acids.

Claim 13

Process according to claim 10 characterized in that the acid is a hydroxy carboxylic acid.

Claim 14

Process according to claim 12 characterized in that the hydroxy carboxylic acid is lactic acid.

Claim 15

Process according to claim 10 characterized in that the acid is phosphoric acid.

Claim 16

The thermosetting coating composition made by the process of claim 1.

Claim 17

Thermosetting coating composition comprising the reaction product of A. a modified polyester which is the reaction product of a. n mols of one or more compounds having two free or latent hydroxy groups, and b. n + 1 mols of a dicarboxylic acid which will not form an anhydride, to form a linear polyester ab carrying terminal carboxy groups, and thereafter modifying polyester ab by reacting the polyester ab with c. an amine alcohol of the general formula HO - (CX2)n - NH2 n being 2 or 3 and X is equal or different and standing for hydrogen, or an alkyl, aryl or hydroxy alkyl radical, at least one of said X being hydroxy alkyl, the amount of ab to amine alcohol being equal to (es - ep) MA wherein MA is the molecular weight of the amine alcohol; es equals the number of carboxy equivalents in the polyester; and ep equals the number of hydroxy equivalents in the polyester, and not exceeding 2 mols amine alcohol per mol polyester ab to provide a polyester containing terminal oxazoline groups, and B. 10 - 60 percent by weight of an aminoplast resin.

Claim 18

Thermosetting coating composition comprising the reaction product of A. a modified polyester which is the reaction product of a. n mols of one or more compounds having two free or latent hydroxy groups, and b. n + 1 mols of a dicarboxylic acid which will not form an anhydride, to form a linear polyester ab carrying terminal carboxy groups, and thereafter modifying polyester ab by reacting the polyester ab with c. an amine alcohol of the general formula HO - (CX2)n - NH2 n being 2 or 3 and X is equal or different and standing for hydrogen, or an alkyl, aryl or hydroxy alkyl radical, at least one of said X being hydroxy alkyl, the amount of ab to amine alcohol being equal to (es - ep) MA wherein MA is the molecular weight of the amine alcohol; es equals the number of carboxy equivalents in the polyester; and ep equals the number of hydroxy equivalents in the polyester, and not exceeding 2 mols amine alcohol per mol polyester ab to provide a polyester containing terminal oxazoline groups, and B. 10 - 60 percent by weight of an aminoplast resin.

Claim 19

Coating composition of claim 16 wherein the average molecular weight of the polyester ab ranges between 500 and 10, 000.

Claim 20

Coating composition of claim 17 wherein the average molecular weight of the polyester ab ranges between 1,000 and 3, 000.

Claim 21

Coating composition of claim 16 wherein in the general formula for the amine alcohol of (c) is 2 and X is a hydroxymethyl radical.

Claim 22

Coating composition of claim 16 to which sufficient inorganic or organic acid is added to render the composition water soluble.

Claim 23

Coating composition of claim 20 wherein the acid is a hydroxy carboxylic acid.

Claim 24

Coating composition of claim 20 wherein the acid is phosphoric acid.